Single-tube bicycle tire



May 29, 1923.

A. M. 'HWENHULME SINGLE TUBE BICYCLE TIRE Filed Aril 2'7 1922 PatentedMay 29, 1923.

`ARTHUR, K. TRENHOLME, OF PORTLAND, DREGQN.

SINGLE-TUBE BICYCLE TIRE.

Application filed April 27, 1922. Serial No. 556,946.

To all whom t may concern Be it known that I, ARTHUR K. Trini;fh Homin,a citizen of the United States, and aresident oi Portland, county ofMultnomah, and State of Oregon, have inventeda certain new and usefulImprovement in Singlellube Bicycle Tires, of whichthe tollowing is aspecification.`

My invention relates to the single tube bicycle tires.` Ordinarily thetires of a bicycle wheel tend to shift around, that is longitudinally,on the wheel rim due to the .ifeight of the rider compressing the tire atrifle, and in so doing moving the tire around on the wheel rim fromtime to time. Since there is a valve projecting from the casing thru therim, said. displacement of the parts frequently 'tears the valve eti.This effect is so frequent as to prove a constant expense in bicyclerepair Work. In order to avoid such displacement of the tire on the lrimit is customary to cement the tire on the rim by shellac or similaragent. But this is very unsatisfactory, because the cement lets looseafter a time; sometimes in a. very short while, when the tire is notkept properly inflated. Besides, when any repair work has to be done onthe tire or rim or spokes of the wheel, the tire must be torn loose fromthe cement, and then cemented on the riml again, which cementng requiresusually several hours before the Wheel can be used without danger of thecement break, ing.

By my improvement I provide mechanical means for holding the tireagainst shifting around on the Wheel rim, Without cementng the tireeasing on the Wheel rim.

My invention brieliy stated, consists in providing that side of the tireseated on the wheel-rim with a reinforcement of Wire cloth or otherpenetration-resisting material, and arranging the wire spokes oi thewheel So as to project thru and beyond the exterior of the rim and bearagainst said reinforcement. When then, the tire is inflated theprojecting spoke ends will be caused to form indentations in, and engagewith the said reinforcement, and thus hold the tire against longitudinalmovement on the wheel rim. Preferably, that wall portion of the tirecasing, which is seated on the wheel rim is thickened, so as to preventthe ends of the spoke from extending into the interior of the tire andpuneturing it.

The construction and operation oil my inA vention is illustrated in theaccompanying drawings, in which:

Fig. l represents a section olE a wheel-rim and its spokes, and alsoshows a section of the tire mounted on the rim, the tire beingr providedwith the reinforcement above referred to 5 Fig. 2 is a cross-section oitthe parts shown in Fig. l, the cross section being taken between thetivo right hand spokes; and

Fig. 3 is a larger scaled cross-section detail illustrating theprinciple ot construction and operation of my invention.

The wheel rim fr,r is preferably made of the cross section illustratedin Figs. 2 and 3l. The rim ijirovided in staggered arrangement with theusual nipples o, in which are threaded the wire spokes 0, as moreclearly shown in Fig. The tire cl is preferably thickened at the side dwhich bears on the wheel-rim, and in suoli thickened portion is imbeddeda reinforcement of wire-cloth c, or other penetration-resisting materialadapted, however, to yield sutliciently to the pressure of the innerends of the wire spokes to permit the latter to torni indentations inthe reinforcing material sufficiently te bring about an engagement ofthe interiorly projecting spoke-end o with the reinforcing material,substantially as diagrammatically illustrated in Figs. 2 and Theseindentations in the reinforcing material are formed when the tire isinlated, and as a result the tire is then held against shiftinglongitudinally on the wheel-rim.

I do not consider it practical to imbed the said reii'iforcing materialin the wall of a tire .not made oil. increased cross section as at (Z,llecause the proj'ec-tino,- outer ends ot the spokes might penetrate thewall oi" the tire suil'iciently to puncture it. In short, in order toavoid pnncturingr the tire, the reinforcing element should be located a.substantial distance from the inner 'face oi the wall of the tirecasing. llVhen that wallportion which bears on the wheel rim isthickened in cross section, as described, the outer portion f of thetire casing having the reinforcing element, forms a saddle, as it were,for the projectingr outer ends ot the spokes to seat on; said projectingends penetrating;` the` rubber wall ol" the tire casing,r until bearingon the reinforcing element, and the socket so formed in the outer rubberwall portion f of the casing, also. contributi to hold the tire againstslipping on the w eel-lim.

Heretofore the project-ing outer ends of the spokes were usually clippedofi' so as to prevent them from penetrating the tire cnsmg andpuncturing the sanne.

A `further advantage of my invention le f that Whilethe ordinary tirecasingr has u' tendency to stretch in service making the eementing ofthe' tire on the rim very diiiiAA @uit und at times almost impossible,by my invention the wire cloth or reinforcinlev materiuml serves toIprevent the sti-etching of the tire easing to av considerable extent andthus on that side seated on said rim, and having therein imbedded areinforcement of penetration resisting material, adapted! to permit theprojecting spoke ends to partially penetrate the walls of said tire,thereby to eect :in engagement between said projecting spoke-ends undthe said side of the tire casing, when the tire is inflated, to hold thetire against Longitudinal movement on the wheelrim.

2A The combination of u wheel. havingr spokes projecting thru amd beyondits rim a single pierre tire, having therein imbedded u reinforcement ofpenetration resisting material, adapted to rmit the projecting Spokeends to pnrtin ly enetrate the walls of said tire` thereby to e ect imengagement between said projecting spoke-ends and the said side of thetire casing, when the tire is inflated, to hold the tire againstlongitudinal. movement on the wheel rim.

ARTHUR K. TRENHOLME.

